Ok, please correct me if I am wrong:

for every slave site in JMS, I need to have a vhost created in apache?

Each of these vhosts in apache should have a different DocumentRoot, but each of these should be a symbolic link to the master site's directory?

Anything else we need to do?

YES this is better to have as many vhost as slave site that provide as many speicifc "document root" as slave site.
Such configuration will give you the possibilty to have specific images and templates directories.

So you have perfectly understood my expected result that will give you all the possible configuration that are available in JMS Multisites.

If you don't do that you will be limited in the creation of slave site with specific images and templates directory.

Thanks Edwin. This is somewhat frustrating, because you actually helped us (through paid support) to configure JMS and our first few slave sites. I'm not sure why we would have had set it up this way if it is not the desired configuration.

Sorry but I don't remember your specific case and I just reply to your question with the generic case - not a speciifc one that I don't remember.
Sorry but in general, 2 or 3 hours after I am doing something fo ra customer, I forget it because I have to reply to another customer and I can not remember each specific cases.

Perhaps there is a specific reason that I don't remember.